【移动应用开发技术】Android中怎么实现一个BLE通信软件

【移动应用开发技术】Android中怎么实现一个BLE通信软件

本文源码/upload/information/20210522/379/526217.jpg具体实现/upload/information/20210522/379/526221.jpg/upload/information/20210522/379/526223.jpg2.扫描设备Widget::Widget(QWidget

*parent)

:

QWidget(parent)

,

ui(new

Ui::Widget)

{

ui->setupUi(this);

//创建搜索服务：https://doc.qt.io/qt-5/qbluetoothdevicediscoveryagent.html

discoveryAgent

=new

QBluetoothDeviceDiscoveryAgent(this);

//设置BLE的搜索时间

discoveryAgent->setLowEnergyDiscoveryTimeout(20000);

connect(discoveryAgent,SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),this,SLOT(addBlueToothDevicesToList(QBluetoothDeviceInfo)));//找到设备之后添加到列表显示出来

connect(discoveryAgent,

SIGNAL(finished()),

this,

SLOT(scanFinished()));

connect(discoveryAgent,

SIGNAL(canceled()),

this,

SLOT(scanCanceled()));

connect(this,

SIGNAL(returnAddress(QBluetoothDeviceInfo)),

this,

SLOT(createCtl(QBluetoothDeviceInfo)));

//开始进行设备搜索

discoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);

}3.将扫描结果添加到QListWidget中//deviceDiscovered

signals

对应的槽函数

void

Widget::addBlueToothDevicesToList(const

QBluetoothDeviceInfo

&info)

{

if

(info.coreConfigurations()

&

QBluetoothDeviceInfo::LowEnergyCoreConfiguration)

//获取设备信息，并判断该设备是否为BLE设备

{

//格式化设备地址和设备名称

QString

label

=

QString("%1

%2").arg(info.address().toString()).arg(());

//检查设备是否已存在，避免重复添加

QList<QListWidgetItem

*>

items

=

ui->ctrBleList->findItems(label,

Qt::MatchExactly);

//不存在则添加至设备列表

if

(items.empty())

{

QListWidgetItem

*item

=

new

QListWidgetItem(label);

ui->ctrBleList->addItem(item);

devicesList.append(info);

}

}

}4.连接蓝牙，停止扫描void

Widget::on_btnConnectBle_clicked()

{

//确认选取了某一个蓝牙设备

if(!ui->ctrBleList->currentItem()->text().isEmpty())

{

//获取选择的地址

QString

bltAddress

=

ui->ctrBleList->currentItem()->text().left(17);

for

(int

i

=

0;

i<devicesList.count();

i++)

{

//地址对比

if(devicesList.at(i).address().toString().left(17)

==

bltAddress)

{

QBluetoothDeviceInfo

choosenDevice

=

devicesList.at(i);

//发送自定义signals==>执行slots:createCtl

emit

returnAddress(choosenDevice);

//停止搜索服务

discoveryAgent->stop();

break;

}

}

}

}5.获取特征void

Widget::searchCharacteristic()

{

if(m_bleServer)

{

QList<QLowEnergyCharacteristic>

list=m_bleServer->characteristics();

qDebug()<<"[xiaohage]list.count()="<<list.count();

//遍历characteristics

for(int

i=0;i<list.count();i++)

{

QLowEnergyCharacteristic

c=list.at(i);

/*如果QLowEnergyCharacteristic对象有效，则返回true，否则返回false*/

if(c.isValid())

{

//返回特征的属性。

//这些属性定义了特征的访问权限。

if(perties()

&

QLowEnergyCharacteristic::WriteNoResponse

||

perties()

&

QLowEnergyCharacteristic::Write)

{

ui->ctrSystemLogInfo->insertPlainText("\n具有写权限!");

m_writeCharacteristic

=

c;

//保存写权限特性

if(perties()

&

QLowEnergyCharacteristic::WriteNoResponse)

{

m_writeMode

=

QLowEnergyService::WriteWithoutResponse;

}

else

{

m_writeMode

=

QLowEnergyService::WriteWithResponse;

}

}

if(perties()

&

QLowEnergyCharacteristic::Read)

{

m_readCharacteristic

=

c;

//保存读权限特性

}

//描述符定义特征如何由特定客户端配置。

m_notificationDesc

=

c.descriptor(QBluetoothUuid::ClientCharacteristicConfiguration);

//值为真

if(m_notificationDesc.isValid())

{

//写描述符

m_bleServer->writeDescriptor(m_notificationDesc,

QByteArray::fromHex("0100"));

ui->ctrSystemLogInfo->insertPlainText("\n写描述符!");

}

}

}

}

}6.发送数据void

Widget::SendMsg(QString

text)

{

QByteArray

array=text.toLocal8Bit();

m_bleServer->writeCharacteristic(m_writeCharacteristic,array,

m_writeMode);

}

void

Widget::on_btnSendData_clicked()

{

SendMsg("Hello

World");

}7.写入数据void

Widget::BleServiceCharacteristicRead(const

QLowEnergyCharacteristic

&c,const

QByteArray

&value)

{

Q_UNUSED(c)

ui->ctrSystemLogInfo->insertPlainText("\n当特征读取请求成功返回其值时：");

ui->ctrSystemLogInfo->insertPlainText(QString(value));

}8.断开连接Widget::~Widget()

{

if(!(m_BLEController->state()

==

QLowEnergyController::UnconnectedState))

m_BLEController->disconnectFromDevice();//从设备断开链接

delete

ui;

}界面布局/upload/infor